Field Evaluation of Fundamental Period of Damaged and Retrofitted Reinforced Concrete Buildings: Case Study of Sarpol-e Zahab Earthquake

Document Type : Research Article

Authors

1 Associate professor, Department of Civil Engineering, Tehran University, Tehran, Iran

2 Assistant professor, Department of Civil Engineering, University of Science and Culture, Tehran, Iran

3 Assistant professor, Road, Housing and Urban Development Research Center, Tehran, Iran

4 Graduated student, Department of Civil Engineering, University of Tehran, Tehran, Iran

Abstract

The fundamental period of a building plays a critical role in determining structural behavior during strong motions such as earthquakes and estimating building base shear in the new design of structures, as well as target displacement in seismic assessment of existing buildings. Thus, having an appropriate estimation of the fundamental period of buildings can considerably affect design and evaluation processes. In this research, to investigate the effects of damages on fundamental periods, ambient vibration tests were conducted on 22 seismically-damaged reinforced concrete (RC) buildings following the earthquake of Sarpol-e Zahab 2017. The obtained values for fundamental periods were compared with their counterparts calculated by empirical relations proposed in the first and fourth edition of the Iranian Code of Practice for Seismic Resistant Design of Buildings (Standard No. 2800) and the first revision of Instruction for Seismic Rehabilitation of Existing Buildings (No. 360). The obtained results for damaged RC buildings with moment resisting frame show a significant difference between fundamental periods of ambient vibration tests and empirical relations such that in a building with a damage state of 4, the obtained period from ambient vibration tests was 2.32 times greater than the calculated value using empirical relations. Furthermore, in retrofitted RC buildings, fundamental periods from empirical relations were up to 1.7 times greater than values determined using ambient vibrations. Therefore, two empirical relations for determining fundamental periods of damaged RC buildings with moment resisting frames and retrofitted RC buildings by adding shear walls are proposed by fitting curves on the obtained results of ambient vibration tests.

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References

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Amirkabir Journal of Civil Engineering
Volume 54, Issue 7
October 2022
Pages 2613-2626

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